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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 1062
Nov. 13, 1923. 1,473,911 B. LIEBOWITZ VIBRATION RECORDING APPARATUS Filed Nov. 12, 1921 2 Sheets-Sheet 2 ^U_v*'" "^49 … Fig. J INVENTOR. BENJAMIN LIEEOHITZ BY ^ZZ^73^^=zrzzfx ATTORNEYClocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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